Dhi Mike 21 Guide
At its heart, MIKE 21 is a two-dimensional, hydrodynamic modeling engine. Unlike simpler one-dimensional models that simulate flow only along a river channel, a 2D model solves the depth-averaged Navier-Stokes equations (specifically the Saint-Venant equations for shallow water). This means it simulates how water moves both horizontally across a landscape and through time, accounting for variations in depth, velocity, and direction. The software’s flexible mesh technology—most notably its use of a non-structured, cell-centered finite volume method—allows it to represent complex, irregular coastlines, islands, and man-made structures with far greater precision than traditional rectangular grids. This adaptive mesh refines resolution in areas of interest (e.g., around a bridge pier or a narrow inlet) while maintaining coarser resolution in deeper, less critical zones, balancing accuracy with computational efficiency.
A typical MIKE 21 project follows:
| Feature | DHI MIKE 21 | HEC-RAS (2D) | TUFLOW / FMP | OpenFOAM / TELEMAC | | :--- | :--- | :--- | :--- | :--- | | Primary Domain | Coastal & Estuarine | Riverine & Floodplain | Floodplain & Urban | CFD & Academic | | Cost | High (Commercial License) | Free (US Army Corps) | High (Commercial) | Free (Open Source) | | Ease of Use | Moderate/Difficult | Easy/Moderate | Moderate | Difficult | | Coastal Capability| Excellent (Tides, Waves) | Limited | Good | Excellent | | Support | Excellent (DHI Support) | Good (Community/Docs) | Excellent | Community only | dhi mike 21
A powerful ecological modelling framework. Users can build custom water quality models (or choose from templates) to simulate: At its heart, MIKE 21 is a two-dimensional,
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